AirLink Communications Raven X HSDPA Guia do Utilizador descarregar pdf (Página 13)

Introduction to the Raven X

Rev 2.0 Mar.10 5

Caution:

If you want to connect remotely to your Raven X using TCP/IP, the IP address

given to your modem by AT&T cannot be a private or internal IP address (such as a special

private network) unless you are on the same network or inside that network’s firewall (such

as with frame relay).

Communication HSUPA

Many of the GSM Networks have been expanded to HSUPA.

HSUPA

HSUPA (High-Speed Uplink Packet Access) is a cellular technology which most

closely resembles a broadband synchronous connection. The upload and

download speeds are maximized to provide a faster throughput, reaching speeds

up to 2.0 Mbit/s for the uplink and 7.2 Mbit/s for the downlink.

Please check with your network provider on the availability of HSUPA.

HSDPA

HSDPA (High-Speed Downlink Packet Access) is a cellular technology allowing

for higher data transfer speeds. In HSDPA mode of operation, max speeds are up

to 7.2 Mbit/s in the downlink and 384 kbit/s in the uplink. HSDPA uses Adaptive

Modulation and Coding (AMC), fast packet scheduling at the Node B (Base

Station) and fast retransmissions from Node B (known as HARQ-Hybrid

Automatic Repeat Request) to deliver the improved downlink performance vs.

UMTS and EDGE.

HSPDA (and HSUPA) falls back to UMTS, EDGE or GPRS (in order of

precedence). This feature allows you to have seamless connectivity no matter

where your Raven X is.

UMTS

UMTS (Universal Mobile Telecommunications System) supports up to 1920 kbit/s

data transfer rates, although most users can expect performance up to 384 kbit/s.

A UMTS network uses a pair of 5 MHz channels, one in the 1900 MHz range for

uplink and one in the 2100 MHz range for downlink.

EDGE

EDGE (Enhanced Data rates for GSM Evolution) provides end-to-end packet data

services with an enhanced connectivity building on GPRS technology and using

the established GSM networks. EDGE provides higher transmission rates and

better transmission quality for data than GPRS. EDGE can carry data at speeds

typically up to 384 kbit/s in packet mode.

When EDGE is not available, your Raven X will fall-back to GPRS for the

connection to AT&T to provide continued connectivity.

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